diff --git a/Makefile b/Makefile
index 30583575a59..0bcd128cc95 100644
--- a/Makefile
+++ b/Makefile
@@ -2054,8 +2054,6 @@ test_c: buildtests_c
 	$(Q) $(BINDIR)/$(CONFIG)/secure_endpoint_test || ( echo test secure_endpoint_test failed ; exit 1 )
 	$(E) "[RUN]     Testing security_connector_test"
 	$(Q) $(BINDIR)/$(CONFIG)/security_connector_test || ( echo test security_connector_test failed ; exit 1 )
-	$(E) "[RUN]     Testing sequential_connectivity_test"
-	$(Q) $(BINDIR)/$(CONFIG)/sequential_connectivity_test || ( echo test sequential_connectivity_test failed ; exit 1 )
 	$(E) "[RUN]     Testing server_chttp2_test"
 	$(Q) $(BINDIR)/$(CONFIG)/server_chttp2_test || ( echo test server_chttp2_test failed ; exit 1 )
 	$(E) "[RUN]     Testing server_ssl_test"
@@ -2236,8 +2234,6 @@ test_cxx: buildtests_cxx
 	$(Q) $(BINDIR)/$(CONFIG)/destroy_grpclb_channel_with_active_connect_stress_test || ( echo test destroy_grpclb_channel_with_active_connect_stress_test failed ; exit 1 )
 	$(E) "[RUN]     Testing duplicate_header_bad_client_test"
 	$(Q) $(BINDIR)/$(CONFIG)/duplicate_header_bad_client_test || ( echo test duplicate_header_bad_client_test failed ; exit 1 )
-	$(E) "[RUN]     Testing end2end_test"
-	$(Q) $(BINDIR)/$(CONFIG)/end2end_test || ( echo test end2end_test failed ; exit 1 )
 	$(E) "[RUN]     Testing error_details_test"
 	$(Q) $(BINDIR)/$(CONFIG)/error_details_test || ( echo test error_details_test failed ; exit 1 )
 	$(E) "[RUN]     Testing eventmanager_libuv_test"
diff --git a/build_autogenerated.yaml b/build_autogenerated.yaml
index 008de951943..d28144e7f4c 100644
--- a/build_autogenerated.yaml
+++ b/build_autogenerated.yaml
@@ -4085,6 +4085,7 @@ targets:
   - upb
 - name: sequential_connectivity_test
   build: test
+  run: false
   language: c
   headers:
   - test/core/end2end/data/ssl_test_data.h
@@ -5731,6 +5732,7 @@ targets:
 - name: end2end_test
   gtest: true
   build: test
+  run: false
   language: c++
   headers:
   - test/cpp/end2end/interceptors_util.h
diff --git a/test/core/surface/BUILD b/test/core/surface/BUILD
index 3d2c51e887b..ad36d1c40a6 100644
--- a/test/core/surface/BUILD
+++ b/test/core/surface/BUILD
@@ -135,6 +135,7 @@ grpc_cc_test(
 grpc_cc_test(
     name = "sequential_connectivity_test",
     srcs = ["sequential_connectivity_test.cc"],
+    flaky = True,  # TODO(b/151696318)
     language = "C++",
     deps = [
         "//:gpr",
diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index 885cae51ab4..5bbee23deee 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -275,6 +275,7 @@ grpc_cc_test(
 grpc_cc_test(
     name = "end2end_test",
     size = "large",
+    flaky = True,  # TODO(b/151704375)
     tags = ["no_test_ios"],
     deps = [
         ":end2end_test_lib",
diff --git a/test/cpp/microbenchmarks/BUILD b/test/cpp/microbenchmarks/BUILD
index 33cca7728af..7e8d371fc3c 100644
--- a/test/cpp/microbenchmarks/BUILD
+++ b/test/cpp/microbenchmarks/BUILD
@@ -283,6 +283,7 @@ grpc_cc_test(
 grpc_cc_test(
     name = "bm_opencensus_plugin",
     srcs = ["bm_opencensus_plugin.cc"],
+    flaky = True,  # TODO(b/151696309)
     language = "C++",
     deps = [
         ":helpers_secure",
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index 4a64de9fdf3..469dfb43a19 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -2423,30 +2423,6 @@
     ], 
     "uses_polling": true
   }, 
-  {
-    "args": [], 
-    "benchmark": false, 
-    "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix", 
-      "windows"
-    ], 
-    "cpu_cost": 1.0, 
-    "exclude_configs": [], 
-    "exclude_iomgrs": [], 
-    "flaky": false, 
-    "gtest": false, 
-    "language": "c", 
-    "name": "sequential_connectivity_test", 
-    "platforms": [
-      "linux", 
-      "mac", 
-      "posix", 
-      "windows"
-    ], 
-    "uses_polling": true
-  }, 
   {
     "args": [], 
     "benchmark": false, 
@@ -4433,30 +4409,6 @@
     ], 
     "uses_polling": true
   }, 
-  {
-    "args": [], 
-    "benchmark": false, 
-    "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix", 
-      "windows"
-    ], 
-    "cpu_cost": 1.0, 
-    "exclude_configs": [], 
-    "exclude_iomgrs": [], 
-    "flaky": false, 
-    "gtest": true, 
-    "language": "c++", 
-    "name": "end2end_test", 
-    "platforms": [
-      "linux", 
-      "mac", 
-      "posix", 
-      "windows"
-    ], 
-    "uses_polling": true
-  }, 
   {
     "args": [], 
     "benchmark": false,